Are car wheel bearings actually part of the wheel, or are they part of the axle?

ride84

New member
I have a 2003 cavalier and the front wheels are making a clunking noise at low speeds and a loud grinding noise at high speeds. I had the tires rotate to see if it was something with the tires them selves, but the noise is still in the front. Are the bearings actually part of the wheels, and if it was the bearings I should hear the noise in the back now? Or are they part of the axle?
 
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